Filtering apparatus



J. H. KRIECK FILTERING APPARATUS Filed April 10. 1936 Jan. 25, 1938.

ATTORNEY. y

uNl'rEof s'l'A'lssl zgicsgls- PATE-NT olrflcs 'I y 2.166.213 mmmo mamans' .um ns1-leek, Newark, N. J.

muessen spell' 1o, leso, sei-u1 No. nous.

e (cl. zio-mi This invention relates to improvements in nltering apparatuses, and is especially intended for i filtering oil in connection with lubricating sys-f tems o i internal combustion Yengines or the like,

6 or with fuel oillines of Diesel engines, or with' supply lines tooil burning systemaor Vin connection with the filtering of any liquid where the removal of impurities therein' is paramount.

It is one of the objects o! the invention to 10 provide in an apparatus oi'this kind, a series of filtering elementswhicb cause an especially high percentage of impuritiesto be extracted from the to permit its-easy removal for purposes oi re-v 25 placement, repair or examinationand without the aid of Ispecial tools.` v

A further object is to provide means in the apparatus which permit by-passing of oil in case the filtering elements should have become clogged 80 up and thus prevent an interruption of the oil Supply.

A still further' object is to provide the appara-v tus with novel means for suspending or attaching it to a suitable place, these means at the same 85 time serving to close the apparatus effectively -mtking its entire removal a' particularly simple s p. Y

Other obiects and advantages will become 'apparent aitera perusal oi' the following speci- I 4 cation and an inspection of the accompanying drawing in which a preferred embodiment of the invention is showin In the drawing, t

Fig. 1 is an elevational front view o! a lterlng 5 apparatus;

rig. 2 ls e. longitudinal seetlofiel view along-'une plane of line 2-2 in Fig. l: Fig. 3 isa plan view of the device; d

50 Fig. 4 is a plan view of the principal iilter element partly in section: and

Fig. 5 is a. fragmentary sectional view drawn to an enlarged scale of an additional nlter elemen Y 55 Like characters of reference denote similar parts throughout theseveral views, and the fo l..

lowing specification. I. IIe is a substantially open cup-'shapedcasing of cylindrical conguration. having an outwardly flanged top II, a slightly reduced lower portion 5 I2 forming a shoulder where it is joined to a slightly larger top portion Il and a bowlshaped bottom I B forming a shoulder I with the v reduced portion I2.

Il is an inlet nipple fastened to the side of 10 the top portion I4 and is providedwith a relatively large inlet Il. The bottom .of theV casing lo. has suitably secured to it by e. angef II, an. outlet nipple zunsvlng e relatively small out ietl passage 2|.and` an outlet pipo 22 preferably l5 hreaded into it. Y

- 23 is a closure to the open top o! the casing I 0 being oi substantially circular shape and hav-v ing an annular groove 2l at its bottom to nt over the outwardly iianged top II of the casing, a re- 20 silient gasket N in the groove electing a iluid' tight'V seal therewith. The top of the closure is rounded at 28 and is provided with a. central boss 21.

28 is a support bracket for the casing IO'cong5v sisting of a substantially vannular ring 29 having a round bore 2B in its center wlthan enlarged portion 3l forming a shoulder l2 adapted to contact with shoulder I3 ofthe casing IIl and to support it. 33 is a i'rontwardly extending 8o projection of the. ring 29 provided with a tapered rectangularly shaped opening 24. Ring 2B is ex'- tended rearwardly and provided with an upwardly extendingv angle. plate 25 connected by ribs 3l v to a support plate 21 which is provided with holes '86 38 for suitably bolting the bracket to a structure, andiwith two frontwardly, and downwardly lx-- tending spaced apart lugs $9.

lll is a yoke of substantially Y-shape, .having a thickened 'central portion II provided .with. a 40 point 42 at its bottom to engage thecentral boss 21 o! the top of the closure 23. A single central 'leg 43 oi they-shaped yoke extends front-,-

aslsaboitliavlngeneadnensaslnstneonso derside of the Tproil'action 23 o! the support bracket 2l, a square-shaped portion Il adjacent -the head engaging the aperture 2l therein, and l a. threaded end`52 disposed between the slot il o rtlleyoke n.sndawlngnut B lbearingupon el the inclined top I5 of the end of the leg 43 of the yoke 43.

6'4 is a principal filter element consisting of a the usual kind having a crinkled vsurface and longitudinal short grooves. The top of the illter unit 59 terminates somewhat below the top of the filter bag 5S.

' 59a is a loop of oord across the top of the filter bag 5l and above the filter unit 59 for convenient handling of the bag and for other purposes specified hereafter. The filter bag 5B' with the filter unit 59 is inserted into the casing I0 so that the loop with the metal ring 51 rests against the shoulder I3. 1

A circular distributor disc 60 has an upturned and outwardly extending flange 3| adapted to rest upon the top of the bag Blite lower depending and angularly disposed portionl tting between the loop tending to spread the ring. 62

are openings through the d isc. To the center of-A the disc is attached a downwardly extending bypass tube 63 having a ball check Il held by a spring 65 against an inlet opening 36. The lower end of the tube extends through the filter unit 59 and the bottom oi the bag 53 and terminates `somewhat above the final outlet 2| from the casing I0. 61 is a coil spring above the distributor disc 80, its upper end contacting with the bottom of the closure 23, thus forcingthe distributor disc tightly against the top of the bag 55 and, the top of the bag tightly against the shoulder I3. whileby spreading the ring 51 the disc forces the sides of the top of the bag against the inside wall of the casing.

Resting against the shoulder I3 at the bottom of the casing Il and having a press fit with its inner wall is an additional filter element 33 consisting of a circular perforated metal disc 33 having an upturned and drawn in flange 'Il clamp-'- ing over the disc a sheet 'II of preferably pure virgin wool reinforced by a sheet of wire nettingV 12. This disc is adapted to slide end oi' the by-'pass tube I3.

The operation of the device is as follows: Oil is admitted under pressure into Ithe upper portion of the filter through inlet I3. It is then spread uniformly over the illter elements by the openings 82 in the distributor disc Il wherebylts velocity is reduced and is forced lengthwise through the filter-unit I9. It is then again illtered by passing through the double layers I3 of the Acotton fabric of the filter bag 3|. 'Ihen at the lower portion of the casing it is again ltered through the` sheet 1I of pure virgin wool fabric. and passes out of the nlter through the final small outlet 2|. V n A There are\thus three distinct stages of lterover the lower ing provided for inthe apparatus, first the filter -'paper, then the double layers of cotton fabric,

and lastly the sheet of pure virgin wool.

Closing of the device is very simply effected by merely placing the yoke Il over Vthe closure plate-23 so that the grooves I3 at the .ends of the two rearwardly extending legs 43A engage the lugs 3,9. The centerpoint l2, of the yoke wntacts with the central. boss 31 and is forced` against it by tightening the wing nut I3 on bolt Il against the inclined top. l! of the front end of leg 43, theinclined surface preventing the wing nut from .slipping off the leg while tightening. The bolt, being fitted in the tapered hole 34 ofthe support bracket 23 can be tilted outwardly to clear the yoke 43 when ,desired to open the device. Y

Attention is now particularly drawn to the fact that the yoke by its unique construction contacts withthree spaced points, namely the ends of the two rearwardly extending legs with the support bracket and the end of the front leg with the 'wing nut of the bolt l and that by tightening this wing put, a uniform pressure is concentrated by a single Ltightening operation upon the center of the closure plate 23. This causes a tight joint to be made between the closure plate and the top flange of the casing Il and the casing to be securely held with its shoulder I3 against the support bracket 2l. The

v coil spring .$1 exerts a pressure against the dis- 'tributar disc 63 and forces it tightly against the top end of the bag 3l which rests also against the shoulder I3 inside ofthe casing I0, the lower tapered portion of the disc 33 entering, as explained beforel the loopat the top of the bag like a wedge and thereby expands the springring 51 making also a tight joint between the looped top of the bag ll and the inside wall of the casing I0 above its shoulder I3. It will thus be seen that the pressure against the top of the closure plate 23 is transferred to the inside of the device to eect a tight sealing between that part of the device which contains the unfiltered oil whereby all oil is forced to pass through the filtering elements.

It is the function of the distributor d isc 6l to cause the oil to be admitted over the filter unit I5!l in separated streams whereby its force and velocity are diminished to a great degreeresulting in more eii'icient iiltering. The outlet 2| is made of a. size much smaller than the inlet I3 to cause a slight back pressure to build up at the outlet end of the filter unit resulting in a partial n balancing of the lter bag and unit and. a still increased and become lhigh enough to overcome the 'pressure of the spring, thus permitting oil to by-pass the filter elements through the tube 33 to the outlet without interrupting the flow of oil.

Attention is also drawn to theI facility with which the'nlter bag 5l with the filter unit 33 can be` removed from the casing. Taking hold of the looped cord Ila at the top of the bag and pulling it will contract the metal ring l1 and thus break' the contact between the top of the bagwith the inside ofA the casing and thereby reduce vthe friction which otherwise would be anobstacle to' an easy removalofthe bag. Y Y ,A

While I have shown a coiled spring to press the distributor disc against the bag, it is obvious, -of course, 4that any other form of spring, a flat spring forinstance, may be used. "So also, the

use 0I the by-pass-arrangementis optional and 'Il i v modale may be omitted, if so desired. Wherever I have made reference to oil, it is to be understoodI that this term is to be interpreted so as to cover any liquid.

It is obvious that various other changes of form, proportion and minor details may be resorted to and the construction modiied to suit many other purposes without departing from the principle or sacriiicing any of the advantages of the invention as defined in the appended claims.

What I claim as new, is:

1. In a `illter casing having an inlet and an outlet and a shoulder therebetween, a cover for the casing, a lter bag having its open top folded over to form a loop, an adjustable ring within the loop,

. a. distributor disc over the top of the bag having4 a depressed tapered portion entering the said bag, and means to force the said disc against the top of the bag and the said top against the shoulder, the said tapered portion of the disc simultaneously spreading the said ring while entering the top oi the bag to force the sides oi the loop at the top of. the bag againsta wall of the casing above the said shoulder. l

2. In a filter casing having an inlet and an outlet and a shoulder therebetween, a cover for the casing, a filter bag having its open top folded over to form a loop, an adjustable ring within the loop, cordstrung across the top of the bag to form a handle, a distributor disc over the top of the bag having a depressed tapered portion entering the said bag, and means to force the said disc against the top o the bag and the said top against the shoulder, the said tapered portion of the disc simultaneously spreading the said ring i while entering the top oi the bag to force the sides of the loop at the top of the bag against a wall oi' the casing above the said shoulder.

3. ln a filter casing having an inlet and an outlet and a shoulder therebetween near its inlet, a cover ior the es; a lter bag having its open top folded over to rest against the said shoulder, a f' filter unit within the bag, a distributor disc over the top of the bag, means to force the said disc. against the .top of the bag and the said top against the said shoulder, the casing having an other shoulder v its outlet, and an additional illter element n the d outlet consisting of a perforated disc tightly pressed within the casing and upon the'salid shoulder near its outlet and rsi iilter sheet clamped upon it.

4. In a lter casing having an outlet and a shoulder therebetween near its inlet, a cover for the casing, a filter bag having'its open top folded over to rest against the said shoulder, a, iilter unit within the bag, va. distributor disc over the top of the bag, means to force thev said disc against' lthe top of the bag and the said top against the said shoulder, the casing having another shoulder near its outlet, and an additional filter element near the said outlet consisting of a perforated disc tightly pressed within the casing and upon the .said shoulder near its outlet and a sheet of virgin wool clamped upon it.

5. In a lter casing having an inlet and an outlet and a shoulder therebetween near its inlet, 'a

Acover for the casing, a filter bag having its open top folded over to rest against the said shoulder, a filter unit within the bag, a distributor disc over the top' of the bag, means to force the said disc against the top of the bag l and the said top against the said shoulder, the casing having another shoulder near its outlet, and an additional iilter element near the said outlet consisting of a perforated disc Vtightly-pressed within the casing and upon the said shoulder near its .outletand a' sheet of virgin wool reinforced -by wire netting clamped upon it.

6. In a illter casing having an inlet and an outlet and a shoulder therebetween near its inlet, a cover for the casing, a` iilter bag having its open top folded over to restagainst the said shoulder, a lter unit within the bag, a distributor disc over the top ot the bag, means to force the said disc against the top oi the bag andthe said r top against the said shoulder, thecasing havingv another 'shoulder near its outlet, an additional filter dise tightly pressed within the casing and upon the said shoulderinear its outlet, and a bypass tube extending from the said distributor disc through the said iter bag, filter unit and lter disc to near the said outlet and having a spring pressed check valve adapted to open and by-pass liquid directly to the outletby an excessive inlet pressure.

JAMES H. CK.

inlet and an 

